National Repository of Grey Literature 16 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Heat exchanger design for using of residual heat of flue gas
Niesner, Lukáš ; Sitek, Tomáš (referee) ; Toman, Filip (advisor)
Bachelor thesis is focused at design of a heat exchanger for getting residual heat energy from flue gases formed by burning beech wood in a fireplace or stove. In first part is situated a brief overview of heat exchangers and what types can be found at market. Second part deal with stechiometric calculation of flue gases origin and their physical properties. Last part is about designing two exchangers, flue gases–air and flue gases–water.
Ultrafine particles filtration efficiency of commonly available materials
Kudláčová, Martina ; Köbölová, Klaudia (referee) ; Sitek, Tomáš (advisor)
In connection with the outbreak of the COVID19 pandemic, there has been a global shortage of personal respiratory protective equipment against ultrafine particles. The citizens were forced to reach for the alternatives and use homemade cloth masks for personal protection. The efficiency of the protection provided by a cloth mask is related to the selection of a suitable material for its production. This thesis contains basic knowledge in the field of aerosol theory, transmission of the SARS-CoV-2 virus, which causes the COVID19 disease and filtration of aerosol particles containing the virus. Based on the theoretical knowledge from the first part, an experimental measurement is performer determining the efficiency of filtration and pressure loss of selected commonly available materials. Based on the results comparison, the most suitable materials for the homemade masks production are selected.
Particle concentration measurement by various methods
Kuruc, Jan ; Kalivodová, Markéta (referee) ; Sitek, Tomáš (advisor)
In addition to the gaseous components, the Earth's atmosphere contains solid and liquid particles from various sources. These particles are monitored and examined mainly due to their environmental and health impacts and many methods are used for their monitoring and measurement. The aim of the research part of this thesis is to bring the topic of aerosol particles, namely their division, the methods of formation closer, to indicate the impact of these particles on the environment and human health, and to further describe the measuring instruments used to measure the concentration of fine particles. The practical part of this work is the measurement of particle concentration using the impactor, the monitoring of particle concentrations and other data measured by the Brno-Arboretum measuring station, as well as the subsequent evaluation of the measured and monitored data. The primary output from the almost 18-day impactor measurement is considered to be the total concentration of all captured particles of 11.56 g/Nm. The size distribution of the captured particles is plotted in the graph, as well as the quantities monitored from the station. The data obtained is compared at the end and the links linking these data are given.
Negative impacts of renewable resources on environment
Kopeček, Marek ; Chýlek, Radomír (referee) ; Sitek, Tomáš (advisor)
Current society understands the need to protect the environment. Renewable energy resources are one of the major topics of environmental protection. Their benefits are reducing greenhouse gas emissions and reducing dependence on fossil fuels. The production process, operation, recycling, and possible accidents of renewable energy resources are investigated in each chapter. Attention was paid mainly to the most used renewable sources. Finally, the negative impacts are evaluated, and it is defined which renewable energy resources could be classified as ecological.
Solar systems utilization for family house energy demand
Šamanová, Jaroslava ; Toman, Filip (referee) ; Sitek, Tomáš (advisor)
Solar systems are more and more common part of residential houses. Main reason for this, is that solar elements are state-supported with subsidies, which is reducing payback time of these investments. At the same time, the prices for these systems are dropping. The state support is connected with effort to reduce dependancy on non-renewable energy sources, e.g. coal powerplants, which are polluting atmosphere. State administration i salso the reason for large scale solar powerplant constructions, which are, according to some opinions, misshaping the landscape and covering large areas of sometimes fertile land.
Energy mix development in the Czech Republic
Špaček, Michal ; Sitek, Tomáš (referee) ; Elbl, Patrik (advisor)
The topic of this bachelor thesis is the development of the energy mix of the Czech Republic. The first part is focused on concepts energy mix, energy security and the goals and priorities of state energy policy. Next part describes the development of the Czech energy mix up to present and in this part, the possible future development of the energy mix of the Czech Republic is described as well. In the last part, the energy mix of the Czech Republic is compared to the energy mixes of Slovakia, Poland, Germany and Denmark and the future development of these energy mixes is predicted as well.
Fine particles and air-cleaning
Bírošíková, Martina ; Sitek, Tomáš (referee) ; Poláčik, Ján (advisor)
This bachelor thesis deals with issues with fine and ultrafine particles, also called particulate matter, which is strongly associated with enviromental problems and negative effect on human health, especially cardiovascular diseases. The aim of this work is to describe the formation and characteristics of fine particles produced by biomass combustion. The experimental part firstly explains funcional principle of used devices and then compares measured concentrations of ultra fine particles produced by combustion of spruce and beech wood. In the end, several posibilites how to eliminate the air pollutants are presented.
CO2 Sources and Emission Trading System
Valentová, Helena ; Sitek, Tomáš (referee) ; Elbl, Patrik (advisor)
This thesis deals with issues of carbon dioxide emissions, its sources and legislation related to emission trading. The first part of the thesis provides basic information about carbon dioxide and its production. The second part summarizes sectors that emit the most carbon dioxide. The last part describes the international legislation related to emission allowances and carbon trading.
Torrefaction Influence on Biomass Structure
Kojecký, Dalibor ; Sitek, Tomáš (referee) ; Elbl, Patrik (advisor)
This bachelor’s thesis is focused on the properties of fuels arising from torrefaction. The opening chapter is dedicated to general research into biomass. This chapter is made for familiarisation with biomass and types of its thermal treatment. The following chapters are dedicated to the torrefaction process. Specifically, a description of this technology and its influence on biomass. The last chapter documents how the individual parameters affect the torrefaction process.
Heat recovery from waste water
Paulíková, Kateřina ; Sitek, Tomáš (referee) ; Toman, Filip (advisor)
The aim of the Bachelor’s Thesis is to discuss the view of wastewater as a source of thermal energy. The thesis is divided into three main chapters. The first chapter aims to acquaint with the issue of wastewater. The analysis of systems for heat recovery from wastewater is summarized in the following chapter. Also there is a focus on systems installed directly at the generation of wastewater, inserted into the sewerage pipes and finally the creation of thermal energy in wastewater treatment plants. All mentioned systems are built to be economical and ecological efficient as possible. Finally, the last chapter includes an overall evaluation of the systems.

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